Dick-and-ditch is the sleaziest member of the one night stand family of sexual scenarios. Essentially, it means that someone gets dicked (in the most metaphorical sense possible - lesbians do it, too), then one or both of the parties involved leave(s) immediately.

There's certainly nothing wrong with dick-and-ditch. If you're in a motel where you're paying by the hour, or engaged in a business transaction, it might even be preferrable. It's just a very clear way of saying, "Thanks for the sex. I'll be on my way now. Have a nice life."

If you're going to dick-and-ditch, don't be a creep about it. Don't say, "I'll call you."